Design and operation of the sub-cooled helium test facility for the LHD helical coils

被引：3
|
作者：
Hishinuma, Y [1 ]
Imagawa, S
Yanagi, N
Mito, T
Nishimura, A
Yamada, S
Takahata, K
Chikaraishi, H
Tamura, H
Iwamoto, A
Hamaguchi, S
Seo, K
Honda, T
Shinba, T
Yoshinaga, S
Satoh, M
Kakui, H
Motojima, O
机构：
[1] Natl Inst Fus Sci, Fus Engn Res Ctr, Gifu 5095292, Japan
[2] Ishikawajima Harima Heavy Ind Co Ltd, Koto Ku, Tokyo 1358733, Japan
来源：
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 2004年 / 14卷 / 02期
关键词：
cryogenic compressor; helical coils; LHD; subcooled liquid helium; test facility;
D O I：
10.1109/TASC.2004.830638
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
In order to increase the cooling stability of the helical coils, an upgrade of the cooling scheme is planned from 4.4 K pool-boiling to 3.0 K sub-cooled helium of flow rate of about 50 g/sec. We have designed and constructed a R&D coil made of the same superconductor as that used for the helical coils and a sub-cooled helium test facility on the assumption of the application for actual Large Helical Device (LHD). This facility is composed of decompression tank for the sub-cooled helium generation, the R&D coil, a current lead storage tank, etc., installed in a cryostat with a liquid nitrogen shield. Two stage cryogenic compressors are installed in the top flange, and sub-cooled helium is generated by decompressing of saturated liquid helium from 0.12 MPa to 24 kPa. Liquid helium of 4.4 K and 0.12 MPa is heat exchanged by the sub-cooled helium in the decompression tank and supplied to the R&D coil from the bottom. The sub-cooling R&D experiment has been carried out. As the results of experiment, we found that the saturated liquid helium could be cooled from 4.4 K to 3.0 K in 8 hours and maintained at 3.0 K. The rotation speed of the first and second stage cryogenic compressors were about 87,000 and 88,000 rpm, respectively. These values agreed well with the designed values of the two-stage cryogenic compressors. Finally, this facility operated stably during 8 days of the two sub-cooling R&D experiment campaigns.
引用
收藏
页码：1435 / 1438
页数：4
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